Mega Code Archive
A NET-compatible event
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using System;
// Derive a class from EventArgs.
class MyEventArgs : EventArgs {
public int eventnum;
}
// Declare a delegate for an event.
delegate void MyEventHandler(object source, MyEventArgs arg);
// Declare an event class.
class MyEvent {
static int count = 0;
public event MyEventHandler SomeEvent;
// This fires SomeEvent.
public void OnSomeEvent() {
MyEventArgs arg = new MyEventArgs();
if(SomeEvent != null) {
arg.eventnum = count++;
Console.WriteLine("Event fired");
SomeEvent(this, arg);
}
}
}
class X {
public void handler(object source, MyEventArgs arg) {
Console.WriteLine("Event " + arg.eventnum + " received by an X object.");
Console.WriteLine("Source is " + source);
Console.WriteLine();
}
}
class Y {
public void handler(object source, MyEventArgs arg) {
Console.WriteLine("Event " + arg.eventnum + " received by a Y object.");
Console.WriteLine("Source is " + source);
Console.WriteLine();
}
}
class MainClass {
public static void Main() {
X ob1 = new X();
Y ob2 = new Y();
MyEvent evt = new MyEvent();
// Add handler() to the event list.
evt.SomeEvent += ob1.handler;
evt.SomeEvent += ob2.handler;
// Fire the event.
evt.OnSomeEvent();
}
}
Event fired
Event 0 received by an X object.
Source is MyEvent
Event 0 received by a Y object.
Source is MyEvent
Event fired
Event 1 received by an X object.
Source is MyEvent
Event 1 received by a Y object.
Source is MyEvent
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